Isntree — Hyper Vitamin C 23 Serum — 20ml

Best for: Dull, uneven, hyperpigmented, or aging skin ready for high-dose vitamin C

23% vitamin C. Maximum brightness. Isntree's most powerful serum.
Isntree's Hyper Vitamin C 23 Serum delivers a clinical-grade concentration of pure L-ascorbic acid to tackle dark spots, uneven tone, and early signs of aging — formulated at a low pH for maximum efficacy.

• 23% L-ascorbic acid — one of the highest concentrations in K-beauty
• Low pH (pH 2.6–3.2) activates ascorbic acid for maximum absorption and potency
• Ferulic acid stabilizes vitamin C and amplifies its antioxidant effectiveness
• Results visible in 2–4 weeks with consistent AM use

Key Ingredients

• L-Ascorbic Acid (23%) — Pure vitamin C — the most researched and proven form for brightening and collagen synthesis
• Ferulic Acid — Antioxidant that stabilizes vitamin C and doubles its UV-protective effectiveness
• Vitamin E (Tocopherol) — Works synergistically with vitamin C for enhanced antioxidant protection

How to Use

1. Use AM only or alternate with your PM retinol routine
2. After toning, apply 2–4 drops and press gently into skin
3. Follow immediately with moisturizer and SPF — vitamin C amplifies sun sensitivity
4. Store in a cool, dark place to prevent oxidation

FKWL Tip
This is a high-potency formula — start 3x/week and build up. Pair with the Isntree Hyaluronic Acid Toner before applying for best absorption. If you're also using the Retinol Serum, do vitamin C AM and retinol PM — never together.